Zahlenbeziehungen (Addition & Subtraktion) - One atta Time

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Determine which letter best represents the missing fact from the fact family.

63 + 17 = 80

17 + 63 = 80

80 - 63 = 17

63 + 80 = 17 80 - 63 = 63 80 - 17 = 63 64 + 17 = 81

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